TylerZ281500
Yukon Ridin High
pull it apart
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master cylinder out of a newer truck. Properly proportioned for rear disks. yours isn't. you'll lock up the back end long before the fronts with the stock proportioning.
Are you saying putting a NBS MC won't work on a 1990?
if i want to upgrade to 3.73 gears for front an rear, front diffs are 8.5 ring gears correct? could I even use a rear axle kit? and if I install a posi traction package in the rear does the front need a posi as well?
Nope, not the same. The front differential is an 8.25" (or possibly a 9.25", but only on 3/4 ton and one ton trucks), much different from the 8.5" rear. You don't want any kind of aftermarket carrier in the front unless you're converting to manual locking hubs IMO. Leave that factory. Just do the gears.